not quite chrome Rated 3 out of 5 stars

-no ability to add other sites' searches.
i.e. http://skreemr.com/results.jsp?q=

http://www.rottentomatoes.com/search/full_search.php?search=

-in chrome, you can type the beginning of a search in the url (go- for google am- for amazon) and simply press tab to then type in your search. typing "@ [something" isn't quite as quick

i love having an omnibar in firefox! but i wish it could be more expansive and streamlined..

This review is for a previous version of the add-on (0.3.1b). 

This is not Google Chrome

Omnibar for Firefox integrates with Firefox's sensitivities.
There are other great addons that help you add custom search engines such as:
https://addons.mozilla.org/en-US/firefox/addon/6887

There was another one that could let you add any form as a search engine by providing a right-click option on the input field!

With regards to TAB-bing behavior, Firefox already has one. When you tab, your selection is moved to the next item in the drop-down. Blindly copying features from Google Chrome could lead to similar change in an existing behavior which, I believe, we should not do.